Commit c1c1368d authored Nov 02, 2016 by Ingo Tuchscherer Committed by Martin Schwidefsky Dec 14, 2016

s390/zcrypt: Fix ap_max_domain_id for older machine types



According to the system architecture the current implementation
requires the presence of the N bit in GR2 in the TAPQ response
field to validate the max. number of domains (Nd).
Older machine types don't have this N bit, hence the max. domain
field was ignored.

Before the N bit was introduced the maximum number of domain was
a constant value of 15. So set this value in case of N bit absence.

Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 14878424

drivers/s390/crypto/ap_bus.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -271,8 +271,11 @@ static int ap_query_queue(ap_qid_t qid, int queue_depth, int device_type,
		*facilities = (unsigned int)(info >> 32);
		/* Update maximum domain id */
		nd = (info >> 16) & 0xff;
		/* if N bit is available, z13 and newer */
		if ((info & (1UL << 57)) && nd > 0)
		ap_max_domain_id = nd;
		else /* older machine types */
		ap_max_domain_id = 15;
		switch (*device_type) {
		/* For CEX2 and CEX3 the available functions
		* are not refrected by the facilities bits.